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drm/i915: Parsing LFP brightness control from VBT 

LFP brighness control from the VBT block 43 indicates which
controller is used for brightness.
LFP1 brightness control method:
Bit 7-4 = This field controller number of the brightnes controller.
0 = Controller 0
1 = Controller 1
2 = Controller 2
3 = Controller 3
Others = Reserved
Bits 3-0 = This field specifies the brightness control pin to be used on the
platform.
0 = PMIC pin is used for brightness control
1 = LPSS PWM is used for brightness control
2 = Display DDI is used for brightness control
3 = CABC method to control brightness
Others = Reserved

Adding the above fields in dev_priv->vbt and corresponding changes in
parse_backlight()

v2: Jani's review comments addressed
	- Move PWM definitions to intel_bios.h
	- Moving vbt_version to intel_vbt_data
	- Rename brightness to bl_ctrl_data
	- Logging just control_pin instead of string
	- Avoid adding vbt_version in dev_priv
	- Since only DDI option is available as of now, let control pin DDI
	affect dev_priv->vbt.backlight.present

v3: Jani's review comments addressed
	- Drop control_pin
	- Use bdb->version
	- set controller to 0 instead of using control pin define
	- check controller bounds
	- remove superfluous changes in intel_parse_bios

Signed-off-by: Deepak M <m.deepak@intel.com>
Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Deepak M 2014-12-15 15:58:21 +05:30 committed by Daniel Vetter
parent d9d8e6b3c0
commit 371abae844
3 changed files with 32 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -1367,6 +1367,7 @@ struct intel_vbt_data {
bool present;
bool active_low_pwm;
u8 min_brightness; /* min_brightness/255 of max */
u8 controller; /* brightness controller number */
} backlight;
/* MIPI DSI */

20
drivers/gpu/drm/i915/intel_bios.c
View File

@ -314,6 +314,7 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
{
const struct bdb_lfp_backlight_data *backlight_data;
const struct bdb_lfp_backlight_data_entry *entry;
const struct bdb_lfp_backlight_control_data *bl_ctrl_data;
backlight_data = find_section(bdb, BDB_LVDS_BACKLIGHT);
if (!backlight_data)
@ -326,6 +327,7 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
}
entry = &backlight_data->data[panel_type];
bl_ctrl_data = &backlight_data->blc_ctl[panel_type];
dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
if (!dev_priv->vbt.backlight.present) {
@ -337,12 +339,30 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
dev_priv->vbt.backlight.controller = 0;
if (bdb->version >= 191) {
dev_priv->vbt.backlight.present =
bl_ctrl_data->pin == BLC_CONTROL_PIN_DDI;
if (!dev_priv->vbt.backlight.present) {
DRM_DEBUG_KMS("BL control pin is not DDI (pin %u)\n",
bl_ctrl_data->pin);
return;
}
if (bl_ctrl_data->controller == 1)
dev_priv->vbt.backlight.controller =
bl_ctrl_data->controller;
}
DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
"active %s, min brightness %u, level %u\n",
dev_priv->vbt.backlight.pwm_freq_hz,
dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
dev_priv->vbt.backlight.min_brightness,
backlight_data->level[panel_type]);
DRM_DEBUG_KMS("VBT BL controller %u\n",
dev_priv->vbt.backlight.controller);
}
/* Try to find sdvo panel data */

11
drivers/gpu/drm/i915/intel_bios.h
View File

@ -402,10 +402,21 @@ struct bdb_lfp_backlight_data_entry {
u8 obsolete3;
} __packed;
#define BLC_CONTROL_PIN_PMIC 0
#define BLC_CONTROL_PIN_LPSS_PWM 1
#define BLC_CONTROL_PIN_DDI 2
#define BLC_CONTROL_PIN_CABC 3
struct bdb_lfp_backlight_control_data {
u8 controller:4;
u8 pin:4;
} __packed;
struct bdb_lfp_backlight_data {
u8 entry_size;
struct bdb_lfp_backlight_data_entry data[16];
u8 level[16];
struct bdb_lfp_backlight_control_data blc_ctl[16];
} __packed;
struct aimdb_header {